Ben Nicholson O.M. (British, 1894-1982) 2 Forms and Curved Lines signed, titled and dated '(2 forms + curved lines) Nicholson april 25-78' (on card verso) ink and oil wash on card, on Artist's prepared board 12 x 15cm (4 3/4 x 5 7/8in) (sheet), 21 x 24.5cm (8 1/4 x 9 5/8in) (board) (unframed)